Republican presidential hopeful Newt Gingrich continues his bus tour of Iowa. After leading in the polls, he's had setbacks in recent days. Negative campaign ads by his opponents have hurt him with some voters. And on Tuesday, the former House speaker found his message side tracked by new disclosures involving the divorce from his first wife.
PBS NewsHour co-anchor Gwen Ifill joins All Things Considered from the Democratic National Convention in Philadelphia, to discuss her 2009 book The Breakthrough. Ifill is re-examining the book's conclusions about black political leadership as President Obama prepares to leave office.
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